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Volumn 126, Issue 4, 2007, Pages

Unimolecular thermal fragmentation of ortho-benzyne

Author keywords

[No Author keywords available]

Indexed keywords

ORTHO-BENZYNE DIRADICAL; RETRO-DIELS-ALDER PROCESS; SUPERSONIC NOZZLE; THERMAL DISSOCIATION;

EID: 33847697769     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2409927     Document Type: Article
Times cited : (75)

References (152)
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    • See EPAPS Document No. E-JCPSA6-126-003702 for a pdf file containing optimum geometric structures of o -benzyne, acetylene, diacetylene, and the retro-Diels-Alder transition state at several levels of theory, as well as CCSD(T)/cc-pVDZ harmonic vibrational frequencies for these stationary points. This document can be reached via a direct link in the online article's HTML reference section or via the EPAPS homepage (http://www.aip.org/pubservs/epaps. html).
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    • Of principal concern is the following text from Wang et al. regarding the barrier (critical energy) of the reaction: "Single-point calculations at CASSCF(6,6) MP26-31G (d) and CASSCF(6,6) MP2/cc-pVTZ yielded a critical energy, E0, equal to 87 and 72 kcal mol-1, respectively. The enthalpy of reaction of o- C6 H4 → C2 H2 + C4 H2 was predicted to be 60 and 44 kcal mol-1 with the 6-31G (d) and cc-pVTZ basis sets, respectively. These values differ by nearly the same amount as that of the critical energy. Correcting the reaction enthalpies by the thermochemical data of Table, and assuming that the same correction can be made for the critical energy, we obtained E0 =83 and 84 kcal mol-1 with the 6-31G (d) and cc-pVTZ basis sets, respectively. These values are supported by a single-point CASPT2/ANO-S calculation, which gave 83 kcal mol-1. " According to the data in our Table, the sensitivity of the reaction energetics to the 6-31G (d) →cc-pVTZ basis set improvement should be much less severe than roughly 15 kcal mol-1. In addition, the CASMP2 method of McDouall et al. employed with the cc-pVTZ basis should not fail so seriously for this problem. [J. J. W. McDouall, K. Peasley, and M. A. Robb, Chem. Phys. Lett. 148, 183 (1988)].
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